I recently purchased a M3. The weather has been terrible since i brought it home and I am having an issue with the trunk filling with snow or rain as soon as I open it to grab my snow brush or charger. Everything from the rear windshield dumps into the trunk as soon as it pops up. I've seen a kind of small lip on the rear window of a few M3's. Does anyone know who makes it and if it actually diverts water away from the open trunk?